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Pipe input stream into OpenVMS backup.

 
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VMS Support
Frequent Advisor

Pipe input stream into OpenVMS backup.

I have a list of files that I want to backup into a single saveset. The list is too long for the 255-limited command line (even using as many wildcards as possible). Does anyone know if/how I can 'pipe' the file list into BACKUP?

OpenVMS 7.2-1H1

Thanks
11 REPLIES
Mike Reznak
Trusted Contributor
Solution

Re: Pipe input stream into OpenVMS backup.

Hi,

what about to define the list into multiple logical names?

Mike
...and I think to myself, what a wonderful world ;o)
Steven Schweda
Honored Contributor

Re: Pipe input stream into OpenVMS backup.

VMS (Alpha) V7.3-2 with VMS732_BACKUP V4.0
seems to have /INPUT_FILES:

BACKUP

/INPUT_FILES

Input Save-Set Qualifier

Directs BACKUP to treat the input-specifier as the file name of a
list of files. This file specifies the input files for a BACKUP
operation.


I don't know how far back this goes, though.
Ian Miller.
Honored Contributor

Re: Pipe input stream into OpenVMS backup.

"BACKUP /INPUT_FILES"
is not in VMS V7.3-1
____________________
Purely Personal Opinion
John Travell
Valued Contributor

Re: Pipe input stream into OpenVMS backup.

Backup /INPUT_FILES is NOT present on V7.3-1 unless it appears in an eco I have not noticed.
JT:
Steven Schweda
Honored Contributor

Re: Pipe input stream into OpenVMS backup.

Yeah. It seems to be new in V7.3-2.
Jan van den Ende
Honored Contributor

Re: Pipe input stream into OpenVMS backup.

Re Steven, Ian & John:

Another good reason to upgrade!

Re Mike:
It sounds like a good idea, but it will only give minor releave: Now the BACKUP command will be smaller, but the DEFINE will be too long. The two MAY be combined to both go halfway, but I am not sure if that will be acceptable to the parser.
Looks like a task for ExtendedDCL, in other words: you would need to upgrade.

.. and that would supply you with several other goodies too!

Proost.

Have one on me.

jpe

Don't rust yours pelled jacker to fine doll missed aches.
Aaron Lewis_1
Frequent Advisor

Re: Pipe input stream into OpenVMS backup.

You can do this with a simple DCL. First create a list of each file you need to backup. I am assuming that these files are located in several different directories and/or node in a cluster.

1) Create a directory to store a list of
the files (DIRX)

2) DIR/NOHEAD/NOTRAIL/out=dirx:list.one
This will give the full path name of
each file.

3) copy all list.xxx into a single file.

4) Create backup DCL:
Open/read mstr dirx:master.list
loop:
read/end=done mstr file
back/log/NOREW tape:bkup_name
goto loop

done:
close mstr
dismount tape
exit

The NOREW is the key. It prevents VMS/tape drive from going back to the begining, and allows you to append as many files as you need.

I can post a more complete example if needed
Wim Van den Wyngaert
Honored Contributor

Re: Pipe input stream into OpenVMS backup.

Aaron,

Don't you have to put "file" on the backup command line too ?

Won't this create a large number of save sets on tape (with identical names) and thus give bad performance/capacity because of the overhead ?

Wim
Wim
Aaron Lewis_1
Frequent Advisor

Re: Pipe input stream into OpenVMS backup.

Wilm, once again, you are correct. I should always wait until I'm on my second cup of coffee before replying. As for the overhead issue, it would have to be a trade-off, if he wants to get all relevent data on a single tape. I suppose, if there was enough free disk space, he could copy all files into a single directory, and then back it up as a single save set.
Karl Rohwedder
Honored Contributor

Re: Pipe input stream into OpenVMS backup.

We circumvented this limitation by defining logical names, e.g.
$ ass file1 1
$ ass file2 2
$ ass file3 3
$ ass 1,2,3 filelist
$ backup filelist ...


A note to /INPUT_FILES:
If you use this qualifier together with /VERIFY, beware that BACKUP uses the diskspec of the last file in the inputfile to verify all files, which leads to a lot of file not found errors.
Engineering can provide you with a fix, but every new backup eco overrides this fix. A real solution shall be provided in the furure.

regards Kalle
regards Kalle
Wim Van den Wyngaert
Honored Contributor

Re: Pipe input stream into OpenVMS backup.

Just an idea :

Mark with dfu all files that you don't need with backup year 2030 (or whatever).
Then backup /before=tom/backup.

Wim
Wim